Azure AKS Encryption at Rest Not Using Private Key Vault

ID: azure-aks-use-private-kv

Severity: high

Author: princechaddha

Tags: cloud,devops,azure,microsoft,aks,azure-cloud-config

Description

Ensure that your Azure Kubernetes Service (AKS) clusters are configured with encryption at rest for Kubernetes secrets in etcd using a private Azure Key Vault.

YAML Source

id: azure-aks-use-private-kv
info:
  name: Azure AKS Encryption at Rest Not Using Private Key Vault
  author: princechaddha
  severity: high
  description: |
    Ensure that your Azure Kubernetes Service (AKS) clusters are configured with encryption at rest for Kubernetes secrets in etcd using a private Azure Key Vault.
  impact: |
    If AKS clusters use a public key vault for secret data encryption, it may expose sensitive data to unauthorized access, leading to potential security risks.
  remediation: |
    Configure your AKS clusters to use private Azure Key Vaults for encryption at rest by setting the 'azureKeyVaultKms.keyVaultNetworkAccess' to 'Private'.
  reference:
    - https://docs.microsoft.com/en-us/azure/aks/developer-best-practices-resource-management
  tags: cloud,devops,azure,microsoft,aks,azure-cloud-config

flow: |
  code(1);
  for (let ClusterData of iterate(template.clusterList)) {
    ClusterData = JSON.parse(ClusterData);
    set("name", ClusterData.name);
    set("resourceGroup", ClusterData.resourceGroup);
    code(2);
  }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      az aks list --output json --query '[*].{name:name, resourceGroup:resourceGroup}'

    extractors:
      - type: json
        name: clusterList
        internal: true
        json:
          - '.[]'

  - engine:
      - sh
      - bash
    source: |
      az aks show --name "$name" --resource-group "$resourceGroup" --query 'securityProfile.azureKeyVaultKms.keyVaultNetworkAccess'

    matchers:
      - type: word
        words:
          - "Public"

    extractors:
      - type: dsl
        dsl:
          - 'name + " in " + resourceGroup + " does not use a private Key Vault for encryption at rest"'
# digest: 4a0a00473045022100f6d65dd9582c77691bbe625af7afaf033939644aa685ca02bb907d904a76af590220371a074db8cc4d1c557d7a19704212e29a67bfb42226955c917d5d5f13f09052:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

$ nuclei -u "URL" -t "cloud/azure/aks/azure-aks-use-private-kv.yaml"

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